fix frame issue when direction set to IGLDropDownMenuDirectionUp
fix frame issue when direction set to IGLDropDownMenuDirectionUp

ManagerOrganization/IGLDropDownMenu,alesanro/IGLDropDownMenu,JackLeeMing/IGLDropDownMenu,bestwnh/IGLDropDownMenu,maxprig/IGLDropDownMenu,lukasthoms/IGLDropDownMenu,jam891/IGLDropDownMenu